If your goal is to get as many show points (and trophies) as you can, then go with stock bias ply. If having a "stock-like" appearance and also making the car more fun to drive....get the radials. Everytime I ran bias plys on my cars to get show points, they would eventually get to me and the radials would go on for good. I think I bought 3 sets of red line bias plys and always ended up switching them over.